12158515 has 8 divisors (see below), whose sum is σ = 14790528. Its totient is φ = 9593280.

The previous prime is 12158507. The next prime is 12158521. The reversal of 12158515 is 51585121.

12158515 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 12158515 - 2³ = 12158507 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 16.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16291 + ... + 17020.

It is an arithmetic number, because the mean of its divisors is an integer number (1848816).

Almost surely, 2^12158515 is an apocalyptic number.

12158515 is a deficient number, since it is larger than the sum of its proper divisors (2632013).

12158515 is an equidigital number, since it uses as much as digits as its factorization.

12158515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33389.

The product of its digits is 2000, while the sum is 28.

The square root of 12158515 is about 3486.9062218534. The cubic root of 12158515 is about 229.9465219081.

It can be divided in two parts, 1215 and 8515, that added together give a triangular number (9730 = T₁₃₉).

The spelling of 12158515 in words is "twelve million, one hundred fifty-eight thousand, five hundred fifteen".